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Is too much sleep making you tired?

Instead of feeling crisp and refreshed, Jesse Wu wakes up sluggish after 12 hours of sleep.

"If I sleep the right amount, I feel really good," said the 25-year-old who lives in a suburb of Chicago, Illinois. "If I sleep too long, I feel groggy throughout the whole day."

Like Wu, some feel exhausted after long hours of rest.

"Many people will tell you, they sleep a little worse when they sleep a long time on weekends," said Dr. Daniel Kripke, co-director of Scripps Clinic Sleep Center in La Jolla, California. "Too much long sleep on weekends does not seem to make people feel better." But he acknowledged that the reasons haven't been determined.

For years, doctors have warned about the dangers of not getting enough shuteye -- traffic accidents, weight gain, decreased productivity and immune protection, but the effects of oversleeping are not well-understood. There isn't medical evidence to recommend that people who sleep long hours should change their habits, Kripke said.

Wu savors his sleep. "I really enjoy it," he said. In the morning, he needs five alarms -- each with a different sound -- that he smacks as he lumbers out of bed.

Like many professionals, Wu sleeps little on the weekdays (about five hours) and makes up for it on weekends, spending eight to 12 hours blissfully hibernating. Sometimes, after a long stretch, he wakes up too tired to function.

"After I've gotten so much sleep, the first situation is I fall asleep at 10 p.m., even though I've gotten 12 hours of sleep, because I feel so groggy," said Wu, who works as a membership coordinator for a professional association.

This is known as sleep drunkenness, when a person hovers between sleep and wakefulness, said Dr. Lisa Shives, medical director at Northshore Sleep Medicine in Evanston, Illinois. In one case, a patient who had sleep drunkenness came to the emergency room because his wife thought he had a stroke.

"They'll wake up and be in this weird state of sleep drunkenness," Shives said. "If it's really severe, you're not going to be in any state to make decisions. If it's just regular [case], a lot of us feel 'blah,' and most of us have to carry on and get going on a shower and cups of coffee."

Oversleeping once in a while doesn't present serious health risks, experts say.

But if you habitually sleep excessively, it could be the result of an underlying health problem. And it could be cutting into your life span.

"There's been at least two epidemiological studies to show that if people get less than five hours, or more than 10 hours of sleep, it increases their mortality," said Michael Breus, the clinical director of the sleep division at Southwest Spine and Sports in Scottsdale, Arizona.Instead of feeling crisp and refreshed, Jesse Wu wakes up sluggish after 12 hours of... more